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First, thanks for this great topic, I have wandered around many times while building a tda2050 single supply amp. It will be used as the power amp section of a small guitar amp.First thing i did was to transfer the single supply layout to stripboard and build it with success. I tested it with 2 9V batteries and it sounded ok as far as i could tell.Then i built the PS based on the schematic of this project. The transformer used was a 15-0-15 with the center left floating. The caps i used are rated for 60V or more. The diodes are taken out of an old VCR - so that's probably a weak point. I can't even find their specs anywhere on the internet...The only component that is different is the 1R resistor that i didn't have - so i used a 2R2 2W. The power supply seems to work fine except for the audible ripple that has to do with mains AC frequency i suspect. The boards are not in a case so I also suspect that my grounding is far from perfect. I just connect the grounds from the boards together and the speaker ground to the negative side of the 2K2 resistor in the PS.Also the wires that connect the PS to the amp board are rather thin, could this be another reason for hum?The hum goes away as i feed the amp with more signal (another clue).The power supply is also on stripboard!

attached are some bad quality images.

ps - I am self learning electronics, the whole process includes a lot of trial and error - this time I don't know how to proceed... thanx for any advice in advance!!!

Sot.

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My first post on this forum - thanks to everyone involved in this project.

Here are some basic questions about the amp of which I cannot seem to find a clear answer. This is my first approach to amp building so I apologize if they are too basic.

1.) What is the desired input impedance of the audio signal? 2.) If I wanted to limit the output power of the amp to 12W for my specific speaker, what will be the most elegant solution? Should I keep the input level limited or lower the overall gain of the amplifier?3.) If I want to add a switch for selecting between two inputs (RCA and mini stereo jack), will a basic toggle switch affect the signal in a negative way?

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